Pozo-Seco Singers, of I Can Make It With You fame:http://www.worldwidewax.com/recs/x6/x630.htm
and various other links, once you have the right spelling.
I found a good few links on www.ixquick.com, a new good metasearch engine. On www.dogpile.com, once you have the name right, there are lots of places to buy their albums.